4.2.3 IR Interface with ABB electricity meters or CMeX Series modules
If the IR interface is to be used beside an ABB electricity meter or other CMeX module, the IR shield (5)
should be removed. The CMeX50 should be mounted on the left side of the ABB electricity meter. There
shall be no space between the CMeX50 and the ABB electricity meter or other CMeX module. (Do not
remove the shield if not used beside an ABB electricity meter or CMeX module.)
4.2.4 Antenna
The antenna should be connected to the SMA connector (8). Depending on signal strength and
environment, a different antenna with extension cable can be used.
IMPORTANT
Please take following in consideration:
• CMeX50 should be connected to the antenna when the wiring of the antenna cable is done.
Otherwise, the SMA connection can be damaged
• Do not mount the antenna close to any metallic objects
• Do not mount the antenna close to the M-Bus 2-wire bus
• Do not mount the antenna inside a metallic cabinet
4.2.5 Wireless M-Bus Receiver
The product can handle any type of wireless M-Bus slave following the wireless M-Bus standard or the
OMS specification. The product can operate in single or combined modes; T1, C1, T1&C1, and S1.
The CMeX50 handles AES encryption of meters with individual key or a global key. If no key for an
encrypted meter is installed, the product will on the M-Bus slave ports respond with a container mode M-
Bus telegram with encrypted wireless M-Bus telegram, see 6.1.4.7. CMeX50 supports encryption modes 5
and 7 in compliznace with the OMS standard.
See section 4.3 for more information on how to install the wireless M-Bus slaves using the LCD display.
4.2.6 Power supply
The installation should be performed by a qualified electrician or an installer with the required
knowledge. The power supply should be connected via a clearly marked, easily accessible and nearby
switch so the unit can be switched off during service work. The main supply should be connected to screw
terminal (1) and screw terminal (2). Main supply voltage should be in the range of 100-240 VAC, 50/60 Hz.
Connect protective earthing to screw terminal (3).
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